Door-check



(No Madel.) C. H. SHAW.

DOOR CHECK.

No. 347,526. .Patented Aug. 17, 1886.

ving my improvement.

d UNITED 'STATES PATENT :Ormea CHARLES H. SHAW, OF BROOKLYN, NEV YORK.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 347,526,.dated August 1'7, 1886. Application filed Juno I0, 1886. Serial NOLIQB. (No model.)

.To all whom if may oon/cern.:

Be it known that I, CHARLES H. SHAW, of Brooklyn, in Kings county, and the State of New York, have invented a certainlnew and useful Improvement in Door-Checks, of which the following is a specification.

I will describe a door-check embodying my improvement, and then point out the various novel features in a claim.

ln the accompanying drawings, Figure l is a perspective view of a door-check embody- Fig. 2 is a side view of the same, showing certain parts in one position in bold outline, and in another position in dotted outline. I have shown a door and door-casing in these figures. Fig. 3 is a perspective view illustrating a modification.

Similar letters of reference designate corresponding parts in all the figures.

A designates a doorcasing. B designates a swinging door, connected thereto at one of the side edges by hinges b. Aspring, C, cony nected to the door and door-casing, closes the door after it has been opened.

D D E E designate my door-check. One part is to be fastened to the door and the other part is to be secured to the door-casing. I have shown the part D D arranged on the door and the part E E arranged on the doorcasing in such position that it will operate with the part D D.

The part D D ofthe door-check consists Vof a tappet and spring, D, and a support, D', therefor. (Shown as made in the form of a case.) The spring may be made of a strip of iiat steel fastened at one end to a non-rotary shaft, d, coiled around the same and having the outer end extended tangentially. The support D has the ends of the shaft iitted in its sides, so as toprevent it from turning. The tangential end of the spring extends through a slot, d', in the supportv or case D. At the extremity of this end of the spring are laterally-extendin g lugs d2. (Shown as formed by securing a crosspin thereto.) The spring l may of course yield, owing to its resilience. The support or case may advantageously be made of malleable iron. It may be made in sections, so as to facilitate the introduction of 5o the shaft and spring.l It may be secured to the part on which it is to be used, by means of screws.

The part E E has two duplicate portions,

E and E', each consisting of an abutment, @,f

and a cam or incline, e', arranged above it. Each of the abutments e has a cam or incline, e', cast integral with it. The pairs of abutments and cams may all be cast together. The pairs of abutments and cams are pivoted by a pin, e2, to a plate, e3. The lugs on the extremity of the tangential end of the tappet are intended to come in contact with the cams or inclines and raise them and the abutments into an elevated position. If the door having the tappet and spring applied to it is closing with a rapid movement, the lugs on the extremity of the tangential end of the spring will strike the ends of the abutments. The movement of the door will then be checked, not suddenly, however, but gradually, because the spring will yield and undergo deflection. Vhile the door has thus been arrested, the tappet, by resuming its normal condition, will swing the door slightly farther open. As soon as the tension of the spring has by this action become relaxed, the cams and abutments will descend, whereupon the lugs on the extremity of the tappet Will enter the space between the abutments and inolines, and the door will close. Vhenever adoor is closing slowly, the tappet will simply raise the cams and abutments and pass between them without acting against the abutments. The cams and abutments will descend by gravity after being shifted by the tappet, the bearing which their ends have against the plate e3 keeping them in their normal position. When the door opens, the tappet will pass from between the cams and abutments.

The plate e3 of the cams and abutments may be secured in its place by screws.

It is not absolutely necessary to use the cams and abutments in duplicate; but if only one cam and one abutment should be used the end of the spring should be perforated, so

that it can embrace and travel over the abutment, as may be understood by reference to Fig. 3.

Instead of having a spring of a iiat form shown, one made of wire can be used.

That I claim as my invention, and desire act on the cam, and, when the door needs to secure by Letters Patent, ischecking, rook the abutment into position to io A door-cheek consisting of an abutnientand resist the closing of the door, substantially as a oaln connected together, and pivotally eon- Specified.

5 neeted to a support, and a tappet and spring, CHARLES H. SHAW.

the said parts being adapted for use in eom- Witnesses: bination on a door and door-casing, arranged JAS. R. BOWEN.

in such relative positions that the tappet will MAURICE J. RoAoH. 

